
CORE INTERNATIONAL, INC.

CNT-AT2

Data bus: 16 bit, ISA

Size: Full-length, full-height card

Hard drives supported: Two ESDI drives

Floppy drives supported: Two 360 KB, 720 KB, 1.2 MB or 1.44 MB drives.

Maximum heads/cyl.: 16 heads and 2048 cylinders

[Image]

                           CONNECTIONS

                  Function                        Location

  34-pin data cable connector-floppy drive           CN1

  20-pin data cable connector-drive 1                CN3

  20-pin data cable connector-drive 0                CN4

  34-pin control cable connector-hard drive          CN5

  4-pin connector-drive active LED                   CN6

                       MISCELLANEOUS TECHNICAL NOTES

    Jumpers JP1, JP2, JP3, JP4, and JP7 are Factory configured - do not
                                  alter.

                   Jumper JP6, pins 2 & 3, are Not used.

                        USER CONFIGURABLE SETTINGS

              Function                     Location           Setting

     Cache enabled                          JP4A               open

      Cache disabled                         JP4A              closed

     32KB data buffer                        JP5            pins 1 & 2
      configuration                                            closed

      8KB data buffer configuration           JP5            pins 2 & 3
                                                               closed

     8/32KB data buffer                      JP6            pins 1 & 2
      configuration                                            closed

     Supports a third floppy (DS2)      JP11/jumper 1          open
      on a twisted cable

      Supports a third floppy (DS4)      JP11/jumper 1         closed
      on a straight cable

     Floppy drive 1 is configured       JP11/jumper 2          open
      as AT type.

      Floppy drive 1 is configured       JP11/jumper 2         closed
      as PS/2 type.

     Floppy drive 0 is configured       JP11/jumper 3          open
      as AT type.

      Floppy drive 0 is configured       JP11/jumper 3         closed
      as PS/2 type.

     Floppy drive port address          JP11/jumper 4          open
      3F0-3F7h

      Floppy drive port address          JP11/jumper 4         closed
      370-377h

     Single-speed floppy supported      JP11/jumper 5          open

      Dual-speed floppy supported        JP11/jumper 5         closed

     Floppy drive Precomp. is           JP11/jumper 6          open
      scaled by data rate:

      500KHz=125ns, 300KHz=208ns,
      250KHz=250ns

      Precomp. fixed at 125ns for        JP11/jumper 6         closed
      all data rates.

     Hard drive port address                JP12               open
      1F0-1F7h

      Hard drive port address                JP12              closed
      170-177h

     Chassis ground is connected            JP16              closed
      to logic ground

      Chassis ground is not                  JP16               open
      connected to logic ground

     Floppy controller enabled              JP17              closed

      Floppy controller disabled             JP17               open

     Hard Drive Interrupt is IRQ14          JP20            pins 2 & 3
                                                               closed

      Hard Drive Interrupt is IRQ15          JP20            pins 1 & 2
                                                               closed

                               BIOS ADDRESS

      Address         JP10/jumper 1     JP10/jumper 2     JP10/jumper 3

        Disabled          open              open               open

        C800h            open              open              closed

         CC00h            open             closed              open

         D000h            open             closed             closed

         D400h           closed             open               open

         D800h           closed             open              closed

         DC00h           closed            closed              open

        Disabled         closed            closed             closed

